JP2675244B2 - Pillar hardware - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base metal fitting for a column base of a steel frame reinforced concrete building.

[0002]

2. Description of the Related Art A steel reinforced concrete column base comprises a steel column and reinforced concrete provided therearound.

As such a steel-framed reinforced concrete column base, the structure shown in FIG. 12 is conventionally used.

In FIG. 12, a column base 40 is a steel frame column 41,
It consists of a reinforcing bar 42, concrete 43, a base plate 44 welded to the steel column 41, and an anchor bolt 45 for fixing the base plate 44.

Anchor bolt 45 is used for foundation concrete 4
It is buried in 6. The base plate 44 joined to the steel column by welding is made of a steel plate and has low rigidity and proof stress.

Therefore, the strength of the steel frame portion of the column base 40 is not sufficient, and only the reinforced concrete portion can exert sufficient strength.

Therefore, in the steel-framed reinforced concrete column base 40 of FIG. 12, it is necessary to increase the performance of the reinforced concrete part by the amount that the performance commensurate with the steel frame part cannot be exhibited. It was necessary to increase the diameter and number of reinforcing bars by adding reinforcing reinforcing bars 47 and underground beams 48.

This reduces the effective space of the building,
Further, in terms of construction, there is a problem that the reinforcing bars 42 are densely packed in the column base 40, which makes it difficult to perform the reinforcing bar work and deteriorates the filling property of the concrete.

Therefore, in order to solve the above problems of the steel-framed reinforced concrete column base shown in FIG. 12, a structure shown in FIG. 13 has been implemented. This steel frame reinforced concrete column base 50 is of a type in which a steel column 51 is embedded in a foundation concrete 56 by about 1 to 2.5 meters.

In this steel-framed reinforced concrete column base 50, since the steel frame columns 51 are continuously embedded in the basic concrete 56, the performance of the column base part 50 is high.
Similarly to Oa, the sum of the performance of the steel frame portion and the performance of the reinforced concrete portion is obtained.

Therefore, the concrete section size of the column base 50 does not become large and the diameter and number of the reinforcing bars 52 do not increase, and the problems of the steel frame reinforced concrete column base 40 having the structure shown in FIG. 12 are solved. It

However, since the steel frame reinforced concrete column base 50 shown in FIG. 13 is embedded in the basic concrete 56 together with the base plate 54 in which the steel frame columns 51 are integrally welded, the anchor bolts 55 are deeper than the basic concrete 56 in the basic concrete 57. Since it needs to be buried, there is a problem that the foundation construction cost will increase.

Further, the work of placing the concrete foundations 56 and 57 is divided into two times, and there are problems that the work is complicated and the construction period is extended.

The inventor of the present invention has previously disclosed Japanese Patent Laid-Open No. 2-161036.
In the publication, a structure as shown in FIG. 14 is proposed. The steel reinforced concrete column base 30 is a steel column 3
1 is not embedded in the foundation concrete 36, and the bottom surface of the column base hardware 34 integrated with the steel column 31 is the same as the upper end surface of the foundation concrete 36, or more via mortar (not shown). It is installed to be above.

The steel reinforced concrete column base 30 shown in FIG. 14 includes a steel frame part, a steel frame part made up of a column base metal part 34 welded to the steel frame column 31 and an anchor bolt 35 for fixing the column base metal part 34, and a reinforcing bar. 32 and a reinforced concrete portion composed of concrete 33.

The anchor bolt 35 has a fixing plate 35 at its lower end.
a is fixed and is embedded in the basic concrete 36 leaving the upper end portion aside. The fixing of the column base hardware 34 to the anchor bolt 35 is performed by a nut via a washer.

FIG. 15 shows a cross section taken along the line A--A of FIG. 14. In the steel column 31, for example, an H-shaped steel 31a and another H-shaped steel 31b formed by longitudinally cutting the central portion are welded and joined together in a web, and the cross-sectional shape thereof is substantially. It has a cruciform shape and is intended for middle pillars.

Reinforcing bars 32 are arranged on the outer periphery at substantially equal intervals and are solidified with concrete 33. The cross-sectional area of the column base 30 is represented by D × B.

FIG. 16 shows a column base metal piece used for the column base 30 shown in FIG. The column base metal fitting 34 has a projection 37b on the bottom plate portion 37a that matches the cross-sectional shape of the steel column 31,
In addition, the projecting base 37c is formed in a curved shape to reduce local stress concentration.

The projecting portion 37b has a projecting length that prevents the bottom plate portion 37a from being bent due to welding with the steel column main body.
The anchor bolt hole 37d is arranged outside the protruding portion 37b.

According to the steel-framed reinforced concrete column base 30 shown in FIG. 14, since the rigidity and the proof stress of the column base metal fitting 34 are superior to those of the conventional ones, the stress applied to the steel frame pillar 31 is applied to the column base metal fitting 34 and the anchor. Through the bolts 35, it can be continuously transmitted to the foundation concrete 36 and further to the foundation flash, and the performance of the steel frame portion can be sufficiently exhibited.

In this steel-framed reinforced concrete column base, however, the anchor bolts are arranged outside each of the projecting portions of the column base metal product, so that the bottom dimension of the column base metal product becomes large.

For this reason, there is a problem that the outer dimensions of the reinforced concrete provided around the pillar pedestal are large, and the space used by the building is restricted.

[0024]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a column base metal fitting for a steel-framed reinforced concrete column base that solves these problems.

[0025] In particular, it is possible to provide a column base metal article which can reduce the outer dimensions of the reinforced concrete provided around the column base metal article without deteriorating the performance of the steel frame reinforced concrete column base, and can effectively utilize the space used in the building. Is.

[0026]

As a result of earnest research in view of the above-mentioned object, the present inventor has made a steel pedestal by welding and joining a column pedestal of a specific shape that is compatible with various cross-sectional shapes of a steel frame column. As a result, the inventors have found that a steel-framed reinforced concrete column pedestal without the above-mentioned problems can be obtained, and arrived at the present invention.

That is, the first pillar pedestal metal fitting for a steel reinforced concrete building of the present invention has a protrusion adapted to the substantially cruciform cross-sectional shape of the steel column on a bottom plate having anchor bolt holes, The portion has an inclined portion of the bottom plate portion for relieving local stress concentration, and anchor bolt holes are arranged at four intersections on the extension line of each flange portion of the protrusion or in the vicinity thereof, and the protrusion is provided. The distance from the outer surface of each flange portion of the section to the outer surface of the bottom plate portion is 100 mm or less in a plan view.

[0028] In the second aspect of the present invention, there is provided a column pedestal metal fixture for a column base of a steel reinforced concrete building, wherein a bottom plate having an anchor bolt hole has a projecting portion adapted to a substantially T-shaped cross-sectional shape of the steel column. The portion has an inclined portion of the bottom plate portion for relieving local stress concentration, and two anchor bolt holes are provided near the outer surface or the inner surface of each of the two flange portions whose inner surfaces face each other. Two other anchor bolt holes are arranged at positions symmetrical to the anchor bolt holes, and the distance from the outer surface of each flange portion of the projecting portion to the outer surface of the bottom plate portion is at least in the span direction in plan view. It is characterized by being within 100 mm.

Further, the third pillar pedestal metal fitting for a steel reinforced concrete building according to the present invention has a protrusion adapted to a substantially L-shaped cross section of the steel pillar on a bottom plate having anchor bolt holes, The protrusion has an inclined portion of the bottom plate portion for relieving local stress concentration, and two anchor bolt holes are provided near the inner surface or the outer surface of each of the two flange portions whose inner surfaces face each other. And two other anchor bolt holes are arranged at positions symmetrical to the anchor bolt hole, and the distances from the outer surface of each flange portion of the protruding portion to the outer surface of the bottom plate portion are respectively the span direction and the column direction. 100m in plan view at least on the outdoor side
It is characterized by being within m.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) First, a pillar pedestal metal object for a middle pillar of the present invention will be described.

FIG. 1 is a perspective view of a column base metal member 1 for a middle column according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a steel-framed reinforced concrete column base for a middle column when the column base metal fitting 1 of FIG. 1 is applied.

The column pedestal 1 in FIG. 1 has an integral structure made of cast steel or forged steel, and has a projecting portion 5 on the bottom plate portion 4 having an anchor bolt hole 3, which is adapted to the cross-sectional shape of the steel column in plan view. And the protrusion 5 has a flange portion 7 and a web portion 8. Further, the protrusion 5 has an inclined portion 6 of the bottom plate portion for relieving local stress concentration, and the four anchor bolt holes are arranged at the intersections of the flanges of the protrusion 5 or in the vicinity thereof. There is.

Conventionally, the anchor bolt holes are arranged in the bolt holes 37d outside the projecting portion 37b as shown in FIG. 16. Therefore, the outer shape of the reinforced concrete is inevitably large. Since the distance was about 250 mm or more, the effective use of space was insufficient. In the pedestal metal object of the present invention, as shown in FIG. 2, the distance M from the outer surface 5a of the protruding portion to the outer surface 4a of the bottom plate portion can be set within 100 mm, so that the reinforced concrete outer shape formed around the bottom plate of the pedestal metal object. The dimensions are kept to a minimum. That is, since the distance L from the outer surface 4a of the bottom plate portion to the reinforced concrete outer shape 9 is usually about 50 mm, the distance N from the outer surface 5a of the protruding portion to the reinforced concrete outer shape 9 can be reduced to 150 mm, and the space can be effectively utilized. Like

As described above, the anchor stud pitch of the pillar pedestal of the present invention is smaller than that of the conventional one. For this reason, anchor bolts made of high-tensile steel with a tensile strength of 50 kgf / mm ² or more are used in buildings where the performance with respect to bending moment or the like generated in the column base metal may be insufficient. This has a higher allowable tensile force than the commonly used SS41 material (tensile strength of 40 kgf / mm ² ) and other mild steel type anchor bolts, and the allowable tensile force of the anchor bolt is increased by the smaller anchor bolt pitch. Therefore, it is possible to solve the problem that the performance of the steel reinforced concrete column base is deteriorated.

Next, FIG. 3 is a cross-sectional view of a steel reinforced concrete column base to which the column base metal fitting of the present invention is applied. The external dimensions of the steel frame column 11 and the flange portion 7 of the projecting portion of the column base metal piece. Indicates almost the same.

FIG. 4 is a cross-sectional view of a steel-framed reinforced concrete column base to which the column base metal fitting of the present invention is applied. When the external dimensions of the steel frame column 11 are smaller than the external dimensions of the flange portion 7 of the projecting portion of the column base metal. Indicates.

Generally, since the pitch of one side of the outer dimension of the steel frame fluctuates in units of 50 mm, the minimum thickness of 12 mm required for welding the steel column and the column base metal and the thickness of the backing metal of about 9 mm are set to about 25 mm on one side of one side. Considering the above, the thickness K of the flange portion of the protrusion of the column pedestal of the present invention is set to about 45 mm or more. As a result, even if the outer dimensions of the steel column are slightly smaller, it is possible to use the same type of column base metal fittings. The column pedestal of the present invention is made of cast steel or forged steel.

(Embodiment 2) Next, a pillar support for side pillars of the present invention will be described. FIG. 5 is a perspective view of a column base metal member for a side column according to another embodiment of the present invention. FIG. 6 is a diagram showing a plan view of the column pedestal of FIG.

The pillar pedestal for side pillars of the present invention is made of cast steel or forged steel, and has a protruding portion adapted to the substantially T-shaped cross section of the side pillar steel frame pillar on the bottom plate portion 4 having the anchor bolt holes 3. 5, the protrusion 5 has a flange portion 7 and a web portion 8
Having.

Further, the projecting portion 5 has an inclined portion 6 of the bottom plate portion for relieving local stress concentration, and the outside of the flange surface of the projecting portion 5 facing in the column direction of the building (see FIG. 6). ) Or 2 near the inside (Fig. 7)
Two anchor bolt holes are arranged, and the other two anchor bolt holes are arranged at symmetrical positions.

As described above, since the anchor bolt holes are arranged near the projecting portion, the outer surface 5 of the flange portion of the projecting portion is formed.
The distances R and S from a to the outer surface 4a of the bottom plate portion can be 100 mm or less in the span direction.
Further, as shown in FIG. 7, by arranging the anchor bolt holes near the inside of the flange portion, the distance from the outer surface of the flange portion to the outer surface of the bottom plate portion can be kept within 100 mm even in the girder direction.

In a steel-framed reinforced concrete building generally used for applications such as condominiums, since a seismic wall is provided as a seismic element in the span direction, the performance of the column base may be small in the span direction, but in the girder direction. In some cases, the performance of the pedestal is required to be large.

In this case, as shown in FIG. 6, the anchor bolt pitch is increased by arranging the anchor bolts on the outer sides of the flange portions of the projecting portions facing each other, and the resistance performance against the bending moment in the girder direction can be increased. In this case, the dimension of the bottom plate of the column base metal in the girder direction increases, and the external dimensions of the reinforced concrete formed around the column base also increase.

Further, in order to solve the problem of deterioration of the performance of the column base due to the reduction of the anchor bolt pitch,
Needless to say, a high-tensile steel anchor bolt having a tensile strength of 50 kgf / mm ² or more as described in the first embodiment can be used.

In the second embodiment as well, it is needless to say that by setting the thickness of the flange portion of the projecting portion to about 45 mm or more, it is possible to deal with the same type of column pedestal metal even if the steel column is a little small.

(Embodiment 3) Further, an embodiment of a column base metal fitting for corner posts of the present invention will be described. FIG. 8 is a perspective view of a column pedestal metal object for corner posts according to still another embodiment of the present invention.
FIG. 9: is a figure which shows the planar form of the column base metal fitting for corner columns.

FIG. 10 is a view showing a plan view of another embodiment of the column pedestal for corner posts. FIG. 11 is a schematic sketch for explaining the arrangement position when the column pedestal metal for corner posts is applied to the building on the site.

The column pedestal metal fitting is used for the column pedestal of a building corner column, and as shown in FIGS. 8 and 9 and FIG. 10 of another embodiment, on the bottom plate portion 4 having the anchor bolt holes 3. Has a protrusion 5 adapted to the substantially L-shaped cross-sectional shape of the corner post steel column,
The protrusion 5 has a flange portion 7 and a web portion 8.

Further, the projecting portion 5 has an inclined portion 6 of the bottom plate portion for alleviating local stress concentration.

The two anchor bolt holes are arranged in the vicinity of each of the projecting portions facing each other, and the other two anchor bolt holes are arranged at positions symmetrical to these. In the column post for corner posts, the distances T and W from the outer surface 5a of the flange portion of the projecting portion to the outer surface 4a of the bottom plate portion are 100 mm or less in plan view on the respective building outdoor sides in the girder direction and the span direction. Is formed in.

Also in this case, by arranging the anchor bolt holes near the inside of the flange portion on the inside of the building, the distance from the outer surface of the flange portion to the outer surface of the bottom plate portion can be kept within 100 mm even on the building side.

Therefore, it is effective when the protrusion to the outside of the building becomes small and the adjacent land boundary Y is approaching.
The column base metal for corner posts also has an integrated structure made of cast steel or forged steel, and the thickness of the flange portion of the protruding portion is about 45 mm or more and high tensile steel as in the first and second embodiments. Needless to say, anchor bolts made by the manufacturer can be used.

[0053]

As described above, the pedestal metal fitting of the present invention is
It is possible to reduce the outer dimensions of the reinforced concrete provided around the column base metal fittings without deteriorating the performance of the steel reinforced concrete column base, and to effectively utilize the space used in the building.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pillar pedestal for a middle pillar of the present invention.

FIG. 2 is a schematic plan view of a pillar pedestal metal object for a middle pillar of the present invention.

FIG. 3 is a transverse cross-sectional view of a steel-framed reinforced concrete column base, showing a case where the external dimensions of the steel frame column and the flanges of the projecting portion of the column base metal are substantially the same.

FIG. 4 is a cross-sectional view of a steel-framed reinforced concrete column base, showing a case where the external dimensions of the steel frame column are smaller than the external dimensions of the flange portion of the projecting portion of the column base metal member.

FIG. 5 is a perspective view of a column base metal member for a side column of the present invention.

FIG. 6 is a schematic plan view of a column base metal member for a side column.

FIG. 7 is a schematic plan view of another example of a side pedestal metal member for a side column.

FIG. 8 is a perspective view of a column base metal member for a corner column of the present invention.

FIG. 9 is a schematic plan view of a column base metal member for a corner column.

FIG. 10 is a schematic plan view of another example of a column base metal member for a corner column.

FIG. 11 is a schematic sketch illustrating the arrangement of corner posts of a building.

FIG. 12 is a vertical cross-sectional view of a conventional steel-framed reinforced concrete column base.

FIG. 13 is a longitudinal sectional view of a conventional steel-framed reinforced concrete column base.

FIG. 14 is a longitudinal sectional view of a conventional steel-framed reinforced concrete column base.

15 is a cross-sectional view taken along the line AA of the column base portion of FIG.

FIG. 16 is a perspective view of a conventional column pedestal.

[Explanation of symbols] 1 pillar leg hardware 2 anchor plate pedestal of bottom plate 3 anchor bolt hole 4 bottom plate of pillar leg metal 5 protrusion of pillar leg metal 6 slope of bottom plate 7 flange of protrusion 4a bottom plate Outer surface 5a Outer surface of flange portion of protruding portion 5b Inner surface of protruding portion 8 Web portion of protruding portion 9 Reinforced concrete outer shape 11 Steel column L L Distance from outer surface of bottom plate portion to outer shape of reinforced concrete M Distance from outer surface of protruding portion to outer surface of bottom plate portion N Distance from outer surface of protrusion to reinforced concrete outer shape (= L + M) R Distance from outer surface of flange to outer surface of bottom plate in span direction S Distance from outer surface of flange to outer surface of bottom plate in span direction W Distance from the outer surface of the flange portion of the protrusion to the outer surface of the bottom plate portion in the span direction T The flange portion of the protrusion portion in the girder direction Distance from the outer surface to the outer surface of the bottom plate Y

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomio Ito 1-9-1 Kitahama, Wakamatsu-ku, Kitakyushu City Wakamatsu Factory, Nittsu Metal Co., Ltd. (72) Inventor Nakano 1-9 Kitahama, Wakamatsu-ku, Kitakyushu No. 1 In Wakamatsu Plant, Nittsu Metal Co., Ltd. (72) Inventor Atsushi Yamada 2-4 Toyo, 2-4 Toyo, Koto-ku, Tokyo Inside Shingu Building Hitachi Materials Co., Ltd. (72) Tadao Takagi 2-4 Toyo, Koto-ku, Tokyo No. 2 Shingu Building in Hitachi Equipment Co., Ltd. (72) Inventor Yuichi Mochida 2-4 Toyo 2-chome, Koto-ku, Tokyo Inside Shingu Building Hitachi Equipment Co., Ltd. (72) Akio Tomita Moto-Akasaka 1-chome, Minato-ku, Tokyo 2-7 Kashima Construction Co., Ltd. (72) Inventor Kuniaki Sato 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yoshihiro Minato-ku, Tokyo Moto-Akasaka chome No. 2 No. 7 Kashima in the Construction Co., Ltd. (56) Reference Patent Sho 63-51541 (JP, A)

Claims (6)

(57) [Claims] 1. A bottom plate having an anchor bolt hole has a protrusion adapted to a substantially cross-shaped cross-section of a steel column, and the protrusion has an inclined portion of the bottom plate for relaxing local stress concentration. While having, the anchor bolt holes are arranged at four intersections on the extension line of each flange portion of the protrusion or in the vicinity thereof, and the distance from the outer surface of each flange portion of the protrusion to the outer surface of the bottom plate portion is, A column base metal fitting characterized by being within 100 mm in a plan view. 2. A bottom plate having an anchor bolt hole has a protrusion adapted to a substantially T-shaped cross-section of a steel column, and the protrusion has an inclined portion of the bottom plate for relaxing local stress concentration. 2 in the vicinity of the inner surface or the outer surface of each of the two flange portions having the inner surface of the protruding portion facing each other.
Two anchor bolt holes and the other two anchor bolt holes at positions symmetrical to the anchor bolt holes, and the distance from the outer surface of each flange portion of the protrusion to the outer surface of the bottom plate portion is at least the span. 1 in plan view
Column base metal fittings characterized by being within 00 mm. 3. A bottom plate having an anchor bolt hole has a protrusion adapted to a substantially L-shaped cross-section of a steel column, and the protrusion has an inclined portion of the bottom plate for relaxing local stress concentration. Two anchor bolt holes are provided in the vicinity of the inner surface or the outer surface of each of the two flange portions in which the inner surfaces of the projecting portions face each other, and the other two anchor bolt holes are located symmetrically with the anchor bolt holes. A column that is arranged and the distance from the outer surface of each flange portion of the projecting portion to the outer surface of the bottom plate portion is within 100 mm in plan view at least on the building outdoor side in each of the span direction and the girder direction. Leg hardware. 4. The column base metal article according to claim 1, wherein all or a part of the flange portions of the projecting portion have a thickness of 45 mm or more in a plan view. . 5. The column pedestal according to any one of claims 1 to 4, characterized in that it is fastened to the foundation concrete using anchor bolts of high-tensile steel having a tensile strength of 50 kgf / mm ² or more. Pillar hardware. 6. The column base metal article according to claim 1, wherein the column base metal frame is made of cast steel or forged steel.